You can consider developing other hobbies and skills for your child so his energy can be put to more positive use. Even things like sports, arts, music etc. can develop a child in many different ways.

From what MOE website suggests, if your child is extremely gifted, you can contact their gifted programme department which they will monitor and make recommendations for your child to the school. I wonder how much they really follow up with this, seeing that it’s not so easy to really follow the development of a child (they grow so fast!).